The Challenge: Make an Antibacterial Cream
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Although we're trying
to prove our antibacterial cream kills bacteria, we need to have some
bacteria samples that remain untreated to show that something will grow
if they are left alone. Scientists call these extra samples controls. And to overcome
inaccurate measuring, replicates
Another beauty of
controls and replicates is that simple statistics can be applied. This
is particularly important if the result of each sample test was minor.
Maybe we would measure the size of the cleared area of each plate and
the mean (average) area for each treatment.
How do we know if we've succeeded?